Question

When the temperature of an object decreases, the average __________ energy of its particles decreases. Since thermal energy is the total kinetic and potential energy of all these particles, the _____ energy of the object decreases.

Answer 1

When the temperature of an object decreases, the average **kinetic** energy of its particles decreases. Since thermal energy is the total kinetic and potential energy of all these particles, the **thermal** energy of the object decreases.